文摘
This paper presents a novel multifunctional magnetic actuator, which not only damp the vibration of machine tools but also measure the cutting force in real time. The actuator is composed of four identical electromagnetic units which are linearized with a novel design strategy. The magnetic force can be delivered in two radial directions for active damping of the flexible structures in the machine tools. Cutting force is estimated from the armature displacement and the control current of the actuator. The performance of both active damping and cutting force measurement are demonstrated on a boring bar which is clamped to the turret of a CNC lathe. Experimental results show that the boring bar vibration is damped significantly with a velocity feedback controller, resulting in a higher chatter-free depth of cut, while the measured cutting force from the actuator agrees with the reference force quite well.